busybox: imported from http://www.busybox.net/downloads/busybox-1.13.3.tar.bz2busybox-1.13.3

Signed-off-by: Bjørn Mork <bjorn@mork.no>

1 files changed, 78 insertions, 0 deletions

diff --git a/libbb/execable.c b/libbb/execable.c
new file mode 100644
index 0000000..5c7ac16
--- /dev/null
+++ b/libbb/execable.c
@@ -0,0 +1,78 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 2006 Gabriel Somlo <somlo at cmu.edu>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+
+/* check if path points to an executable file;
+ * return 1 if found;
+ * return 0 otherwise;
+ */
+int FAST_FUNC execable_file(const char *name)
+{
+	struct stat s;
+	return (!access(name, X_OK) && !stat(name, &s) && S_ISREG(s.st_mode));
+}
+
+/* search (*PATHp) for an executable file;
+ * return allocated string containing full path if found;
+ *  PATHp points to the component after the one where it was found
+ *  (or NULL),
+ *  you may call find_execable again with this PATHp to continue
+ *  (if it's not NULL).
+ * return NULL otherwise; (PATHp is undefined)
+ * in all cases (*PATHp) contents will be trashed (s/:/NUL/).
+ */
+char* FAST_FUNC find_execable(const char *filename, char **PATHp)
+{
+	char *p, *n;
+
+	p = *PATHp;
+	while (p) {
+		n = strchr(p, ':');
+		if (n)
+			*n++ = '\0';
+		if (*p != '\0') { /* it's not a PATH="foo::bar" situation */
+			p = concat_path_file(p, filename);
+			if (execable_file(p)) {
+				*PATHp = n;
+				return p;
+			}
+			free(p);
+		}
+		p = n;
+	} /* on loop exit p == NULL */
+	return p;
+}
+
+/* search $PATH for an executable file;
+ * return 1 if found;
+ * return 0 otherwise;
+ */
+int FAST_FUNC exists_execable(const char *filename)
+{
+	char *path = xstrdup(getenv("PATH"));
+	char *tmp = path;
+	char *ret = find_execable(filename, &tmp);
+	free(path);
+	if (ret) {
+		free(ret);
+		return 1;
+	}
+	return 0;
+}
+
+#if ENABLE_FEATURE_PREFER_APPLETS
+/* just like the real execvp, but try to launch an applet named 'file' first
+ */
+int FAST_FUNC bb_execvp(const char *file, char *const argv[])
+{
+	return execvp(find_applet_by_name(file) >= 0 ? bb_busybox_exec_path : file,
+					argv);
+}
+#endif